Massey 175 deisel....just quit !

There are two seperate fuel transfer pumps for your type of fuel system. One is located on the outside of the engine and driven by the camshaft. This pump forces the fuel through the fuel filter (s) and then to the fuel injection pump. The second pump is a transfer pump located inside of the fuel injection pump which pressurizes the fuel injection pump. This pump will pump fuel when the engine is turning, but if the fuel is off (fuel shutoff lever pull to rear), fuel will come from the injector lines but the pressure will be low and not sufficent to open the injectors. When the fuel is on (lever pushed to front) the transfer pump sends low pressure fuel through the metering valve. From the metering valve, the correct amount of fuel is then sent to the pump plungers which convert the fuel from a low pressure to a high pressure. The correct amount of high pressure fuel leaves the pump and travels to the injectors.
In order to notice this high pressure,be sure the lever is forward, loosen an injector line a small amount and fuel will spray from the fitting while the engine is turning. If there is fuel there but not spraying, the fuel is off, (lever pulled to the rear). You must have high pressure for the engine to run. You will always have fuel there while the engine is turning, but the fuel pressure on the injector lines will be low or high pressure. Low pressure will be a constant stream, while the high pressure is not. Look for the position of the fuel shutoff lever. That would be the best place to start. Good Luck!